How to Seal Polyurethane?

RF welding is also known as Dielectric welding or High Frequency (HF) welding, which means it is a method of joining thin sheets of polar thermoplastic material together. RF welding uses high frequency (13 to 100 MHz) electromagnetic energy to fuse the materials together.

The material is placed on the table and the sealing process of the two materials is directed by dies as the upper platen comes down, squeezing them together. The sealing takes place when radio frequency waves are sent through the small area between the table and die, that is occupied by the materials to be fused together.

The radio frequency (typically 27.12 MHz) will excite the molecules, making them move faster, which then creates heat. The internal heat will end up melting the polyurethane to seal the material together. Additionally, high frequency, or dielectric sealing, is the process of heating the material from within, which can be localized using tooling.

The result of the process is a seamless area made of a stronger bond than the original material. Once the welding has been completed, SealWerks can finish your welded product with any of our additional in-house services, which include RF welding, sewing, and die cutting services.

Welding polyurethane with another material, like vinyl, is a process that must be checked for compatibility. The most common materials used for RF sealing are polyurethane and PVC while other polymers like Nylon, EVA, PET, and some ABS plastics can be welded using this process.

The result is a product that will contain a substance within the material or that the product will keep unwanted substances out. No matter what it is you require in a welded polyurethane product, SealWerks is an industry leader for commercial sewing and radio frequency welding services. We streamline the “concept to product” process. We will combine your ideas with the absolute best innovative technology to create a product that will exceed your expectations.